SNELSON@STL-HOST1.ARPA.UUCP (11/23/87)
I WOULD LIKE TO START SOME DIALOG ON ISDN. MY FIRST PARTICULAR HANG UP IS WITH THE WIRING SCHEME. 6 OF THE 8 CONDUCTORS TO AN RJ45 TYPE JACK ARE ASSIGNED (B+D). I WOULD LIKE TO SEE THE UNASSIGNED ASSIGNED AS POWER -12V TO +12V TO POWER EQUIPMENT. TO MANY OF THE NEW NETWORKING SCHEMES REQUIRE POWER OUTLETS TO MATCH COMM EQUIPMENT HANGING ON THE END OF THE WIRE. ANOTHER THING I THINK SHOULD BE LOOKED AT IN MORE DETAIL IS POWER AND ESPECIALLY GROUNDING. FIPS 94 IS POSSIBLY THE BEST DOCUMENT WRITTEN TO DATE ON THIS SUBJECT AND A LOT OF THINGS I SEE BEING TALKED ABOUT SEEM TO BE RELATED TO NOISE DUE TO IMPROPER GROUNDING TECHNIQUES, ESPECIALLY IN DIGITAL SWITCHING, BUT I HESITATE TO START THROWING STONES ABOUT THIS SINCE I WOULD NOT HAVE THE VAGUEST IDEA OF HOW SOMEONES PLANT WAS WIRED. REGARDS, STEVE
gnu@hoptoad.UUCP (John Gilmore) (12/13/87)
I recently got some information on ISDN from a friend. This is from handwritten notes, so it may be somewhat garbled, and it's all preliminary and subject to change, but at least it's a starting point. Pacific Bell will eventually offer tariffed ISDN service, probably about 1990. They are proceeding with ISDN and also continuing their Project Victoria experiment, which they claim is more useful (e.g. it only gives 32Kb/sec to voice, since that's all that's needed with modern codecs). The ISDN service is expected to offer traditional 2B+D service (2x64Kb/sec and 1x16Kb/sec over a single pair of wires), at a rate about 25-30% above the basic monthly rate for voice phone service. It is not clear whether unmeasured service will be offered, or in what exchanges it will first be implemented. There are three classes of service contemplated: * digital voice (which can be routed through analog switches, e.g. to call normal telephones) * packet data, at about $.35/Kseg, where a segment is <= 128 bytes and might be able to move over either a B or D channel. * circuit switched data, at about $.05-.15/minute. From a very brief cost analysis I conclude that, at these rates, I probably won't want ISDN service. Telebit modems on regular voice lines will only run 18Kb/sec but compare favorably on cost/byte and talk to anybody anywhere who has one (as well as to 300/1200/2400 modems). And residence users can run them on unmeasured service for local calls.
MYERSTON@KL.SRI.COM (HECTOR MYERSTON) (04/15/88)
ReSent-